Rotary Systems feature direct-drive design.

Press Release Summary:

With no gearboxes or worm gear drives, Super-Precision® Rotary Systems produce accurate bidirectional response with .01 arc/sec repeatability and zero backlash. Featuring pneumatic collet closer with dual cylinder that delivers 4,560 lb adjustable draw bar pull, A2-5 16C is suited for precision machining or jig grinding applications. System A2-4 5C provides indexing speed of 3,600°/sec making it suited for drill and tap, laser processing, and high-speed milling applications.

Original Press Release:

Hardinge Demonstrates Gearless Rotary Products At Westec

Hardinge will be demonstrating their new Direct-Drive, Super-Precision® Rotary Systems in booth #2700 at WESTEC. High-speed and high-torque models with Super-Precision positioning and repeatability have no gearboxes or worm gear drives. The direct-drive design eliminates backlash, which results in high servo stiffness and extremely rapid and accurate bidirectional response with repeatability of .01 arc/sec. When the command is given to stop at a certain angular location - it absolutely stops at that precise location with no overshoot and will repeat exactly.

Hardinge's newest Quick-Change Rotary Systems incorporate a direct-drive, rare-earth permanent-magnet torque motor. This frameless motor wraps around the spindle, eliminating the need for a separate motor extension resulting in a much smaller footprint. The ± .077 arc/sec resolution, ± 2.19 arc/sec accuracy encoder is mounted directly on the spindle to ensure extremely accurate positioning.

When operated as an integrated axis on a high-speed VMC utilizing look-ahead programming, the Hardinge Direct-Drive system's combination of zero backlash, high servo gain, and rapid acceleration will enable the user to operate at the maximum capability of the machine. A rugged cross roller bearing is used for high-moment loads with super rigidity. The bearing is permanently lubricated, and there are no brushes to wear or to create dust, providing a smooth quiet operation, and a life that is expected to outlast the host machine. A clamp/brake option is available for aggressive off-center drilling and milling cuts.

The A2-5, 16C High-Torque Direct-Drive Rotary System is ideal for difficult, high precision machining or jig grinding applications requiring 4- or 5-axis interpolated machining or for parts that require extremely accurate angular positioning. A pneumatic collet closer is equipped with a dual cylinder resulting in 4560-pound (2068kg) of adjustable draw bar pull. A 7" (177.8mm) spindle centerline height will accommodate a large 305mm diameter slotted faceplate.

The A2-4, 5C High-Speed Direct-Drive Rotary System is designed to position extremely fast with a high degree of accuracy and without backlash. An astonishing 3,600 degrees-per-second indexing speed combined with the gearless direct-drive features make this indexer ideal for drill & tap, laser processing, and intricate or high-speed milling applications. A 4" (101.6mm) spindle centerline height and a fail-safe, through-hole collet closer is standard. The High Speed System is offered as both an integrated 4th axis or as a standalone indexer driven by Hardinge's all-digital, user-friendly servo control.

Hardinge's A2-4 (5C) and A2-5 (16C) spindle nose designs allow quick change between collets, expanding collets, step chucks, power chucks and face plates. Common spindle tooling can be shared between the Hardinge Quick-Change Rotary system(s) and a lathe. The gripping is in the spindle, closest to the spindle bearings, unlike surface-mounted adapters used on traditional rotary tables. Multiple workholding options provide alternate gripping methods, will reduce setup time and increase precision capabilities.

All Hardinge Rotary Systems and new trunnion products are manufactured to strict specifications in Elmira, New York. For more information call 800-510-3161, fax 607-734-3886, email or visit

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